自由群的高可迁表示的注

自由群Fη(1＜η≤()0)在有理数集Q上有一个高可迁表示,若T是无理数集上的一个任意可数稠密子集,则可使得T是^Fη的一个轨道且对任意e≠^w∈^Fη变换T中的每一个点.     

关于几乎同胚的研究

本文讨论几乎同胚的性质.其中包括几乎同胚之间的关系,几乎同胚与同胚的关系,几乎同胚与粘合映射的关系及几乎同胚像的性质.     

Dense fog events in the Yangtze Delta and their climatic characteristics

Based on daily observation records of fog and atmospheric visibility from 24 meteorological stations in the Yangtze Delta in the period from 1954 to 2005, the identification standard of dense fog events (DFE) has been proposed in this paper, a quite complete time series of DFEs for the delta constructed, and the climate characteristics of these events analyzed sequentially. Preliminary results showed that there were 564 typical DFEs in the delta from 1954 to 2005. The most frequent season for DFEs was from October to next April, when the number of the events accounted for 89.9% of the annual total, while the least frequent season was summer, when the number only accounted for 1.6% of the total due to higher temperature and more convective weather in the season. In the Yangtze Delta, DFEs occurred less and were weaker in the 1960s, but turned to increase from the end of the 1970s to the beginning of the 1980s, with an abrupt change in 1978. Afterwards, DFEs occurred more frequently, intensively, and indeterministically, and in particular, most frequently in the 1980s and intensively in the 1990s. However both the frequency and intensity of DFEs decline apparently in the period of 2000—2005 in the delta.     

可控的量子密集编码

提出了一种利用三粒子非最大纠缠态作为量子信道的可控的概率密集编码方案.第3方通过局域测量控制着量子信道.通过引入辅助粒子和做适当的幺正变换,就能以一定概率实现量子密集编码.     

单颗粒尾涡特性的大涡模拟

稠密气固两相流中颗粒尾涡的存在对其他颗粒的运动及两相流场结构的影响不可忽略. 本文采用大涡数值模拟的方法研究了气体流过一个100?m颗粒的尾涡特性, 对比计算了在不同颗粒雷诺数Rep下颗粒尾涡的存在对局部气流速度、压力的影响. 结果表明,Rep=100时尾涡影响区域的长度达颗粒粒径的5倍,颗粒前后最大压差达373.48Pa.     

密柱-钢板深梁结构抗震性能试验研究

提出了一种内藏密柱-钢板深梁混凝土组合剪力墙,密柱-钢板深梁为其核心钢构.为研发高性能密柱-钢板深梁结构,对4个具有不同设计参数的试件进行了低周反复荷载试验.试件的密柱分为方钢管混凝土、圆钢管混凝土、工字钢3种截面,钢板深梁分为Q235,Q345两种钢材,试件剪跨比为1.5.基于试验,分析了各试件的承载力、刚度及退化过程、延性、滞回特性、耗能、损伤与破坏过程,提出了密柱-钢板深梁结构承载力计算模型,计算结果与实测结果符合较好.研究结果表明:"强密柱、弱钢板深梁"型结构可实现延性屈服机制;密柱截面用钢量相同时,采用圆钢管混凝土密柱的结构性能最好;与采用Q345钢板深梁的结构相比,采用Q235钢板深梁的结构虽承载力略小但延性更好;密柱-钢板深梁结构具有良好的抗震性能和延性屈服机制.     

关于素环的两个定理

本文改进了文献中的一个有用的定理,此定理是研究素的导子及可加映射的重要工具。     

利用三能级部分纠缠态的量子密集编码

量子信道为最大纠缠态的密集编码方案中,编码操作可以分为翻转操作和相位操作.存在相位编码操作是实现密集编码的关键,构造了量子信道为三能级部分纠缠态的相位密集编码算符,并给出了存在相位编码的条件.     

等密拟阵在图论中的一个应用

研究等密拟阵在图论中的一个应用。由τc(G)的表示式,讨论了F∈β〔M′〔n-c〕〕的等价条件。证明了η〔M′〔n-c〕〕=τc(G)。结合等密拟阵的定义推得(ⅰ)τc(G)≥k的充要条件;(ⅱ)τc(G)=s等价条件;(ⅲ)当c=1时τc(G)的图论意义。